P0253 is set when "0"A in control circuit of Fuel pressure regulator valve(Fuel Metering Unit)(integrated with high pressure pump) is detected for more than 0.22 sec. This code is due to open of short to ground in control circuit or Fuel pressure regulator valve(Fuel Metering Unit) internal open.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
Fuel pressure regulator valve(Fuel Metering Unit) circuit
•
Fuel pressure regulator valve(Fuel Metering Unit) component | ||
Enable Conditions |
•
IG KEY "ON" | |||
Threshold Value |
•
Short to GND, Wiring open | |||
Diagnostic Time |
•
500ms | |||
Fail Safe | Fuel cut | NO | ||
EGR Off | NO | |||
Fuel Limit | YES | |||
Check Lamp | YES | |||
